Sampling Methods
In which type of sampling is the population divided into several groups, called strata, and then a random sample is selected from each stratum?
stratified random sample
A population consists of the following: 4, 5, 6, and 7.
How many different sample sizes of 2 can you draw from this population?
4C2 = 6
Find the sampling error for the following sample:
260, 270, 275, 275, 280
0.6
Each member at a business conference is given a number at random; this number will be used to determine who gets one of several prizes, as determined using a table of random numbers to select members. What type of sampling method is being used?
simple random sample
A population consists of the following: 4, 5, 6, 7, 8, 9, 12, 14.
How many different sample sizes of 3 can you draw from this population?
56
The difference between a sample statistic and its corresponding population parameter
Sampling error
Give an example of a systematic random sample:
any sample where a random starting point is selected, and then every kth item thereafter is selected for the sample
A population consists of the following: 4, 5, 6, and 7. With sample sizes of 2, what is the mean of the sampling distribution?
5.5
The standard deviation of the sampling distribution of the sample mean is also called
standard error of the mean
What are four reasons why we would prefer to use samples rather than population?
1. To contact the whole populations would be time
consuming.
2. The cost of studying all the items in a populations
may be prohibitive.
3. The physical impossibility of checking all items in
the population.
4. The destructive nature of some tests.
A population consists of the following: 4, 5, 6, and 7. With sample sizes of 4, what is the mean of the sampling distribution?
5.5
The number of cupcakes sold daily has a population mean of 271.4 and a population standard deviation of 10. Using sample sizes of 4, what is the standard error of the mean?
5